CLINTON: NORTH AMERICAN USTILAGINEAE. 
355 
This species is peculiar because of the very elongated spores that 
are often found and which are sometimes seen adhering in chains; 
but more especially because of the filaments which are scattered 
among the spores and which become visible as a conspicuous brush 
upon their dispersal; Ustilago caricicola seems hardly distinct from 
this species, which is variable. The specimens reported from Mex¬ 
ico and Jamaica show the spores rather regular, being subspherical 
or spherical and 4.5-8 p in diameter. The germination of the spe¬ 
cies has been reported by Brefeld : 20. 
Ustilago Triplasidis Ell. & Ev., n. sp. 
Sori in ovaries, ellipsoidal, about 3-4 mm. in length, protected by 
thin membrane, showing between the glumes of most of the spike- 
lets ; spores light reddish brown, often lighter colored on one side, 
ovoid to chiefly subspherical or spherical, usually abundantly but 
very minutely echinulate, 5-9 p in length. 
Host: Triplasis Americana , Miss. (type). 
The writer first saw this specimen in the herbarium of A. B. 
Seymour who collected it in Mississippi, in 1891. It was thought 
to be a new species but the host was unknown. A few months 
later it was found in the herbarium of the N. Y. botanical garden 
under the unpublished name given here. This latter collection was 
made by Tracy also in Mississippi, in 1892. The infected ovaries 
often show the remains of the styles at their apex. The spores have 
not been germinated. 
Ustilago sparsa Underw. 
Ustilago sparsa Underw., Bull. Torr. Bot. Club, 24: 86. 1897. 
Exsiccati: Ustilago destruens Schl , on Dactyloctenium Aegyptiacum, 
Rav., Fungi Amer., 790; Ustilago sparsa Underw., on Dactyloctenium 
Aegyptiacum, Seym. & Earle, Econ. Fungi, Clinton Ust. Supp. C 86. 
Sori in the ovaries, ovate, usually infecting few of the spikelets, 
about 2—3 mm. in length, with rupture of covering disclosing dusty, 
brown black spore mass; spores light reddish brown, ovoid or 
ovate to spherical, distinctly echinulate, chiefly 6-10 p in length. 
Host: Dactyloctenium Aegyptiacum , Ala. (type), S. Car. 
Hennings has described two species of Ustilago on Dactyloctae- 
nium, but both appear distinct from this, though his Ustilago 
